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Examines the movement, interior geology, atmosphere, and other characteristics of the planet on which we live.

A description of Earth, the third planet from the sun, which includes information on its origins, composition, and unique characteristics.

Describes the characteristics of Earth, including its origins and composition.

Question-and-answer format reveals the secrets of the universe.

A door opened to another universe, and a desperate Earth's energy crisis seemed over.

A description of Earth, the third planet from the sun, which includes information on its origins, composition, and unique characteristics.